05.08.2011, 04:18 nino loss wrote: I still get a peak error of 18.381637 and an average of 7.896481 ! IMHO, It's OK for camera profiling. This number depends of the uniformity of illumination, of lens and sensor uniformity and metamerism phenomenon. You can check uniformity of target illumination and lenses by shooting clean white paper sheet in place of target.